*{
  margin: 0;
  padding: 0;
}
body , html{
  width: 100%;
  height: 100%;
  position: relative;
  min-width: 1300px;
}


li {
  list-style: none;
}

a {
  color: black;
  text-decoration: none;
}

/* 页面头部 */
.header {
  width: 100%;
  height: 60px;
  background-color: rgb(90, 41, 41);
}

/* 页面内容 */
/* .main {
  width: 1200px;
  margin: 0 auto;
} */

/* 视频背景板 */
.learn_video_background {
  width: 100%;
  min-width: 1300px;
  height: 675px;
  background-color: black;
}

/* 视频盒子 */
.learn_video_div {
  margin: 0 auto;
  width: 1200px;
  height: 675;
}

/* 学习视频 */
.learn_video {
  margin: 0 auto;
  width: 1200px;
  height: 675px;
}

/* 视频下子导航 */
.course_subnav {
  width: 100%;
  min-width: 1300px;
  height: 68px;
  background: #fff;
  box-shadow: 0 4px 8px 0 rgb(28 31 33 / 10%);
}

/* 视频下子导航盒子 */
.course_subnav ul {
  padding: 0;
  margin: 0 auto;
  width: 1200px;
  background-color: aqua;
}

/* 视频下子导航项目 */
.course_subnav li {
  position: relative;
  float: left;
  width: 150px;
  height: 68px;
  margin: 0 80px;
  font-size: 18px;
  color: #545c63;
  line-height: 68px;
  cursor: pointer;
  font-weight: 700;
  text-align: center;
}

/* 视频下子导航项目选中 */
.course_subnav .checked {
  color: #f20d0d;
}
.course_subnav .checked::after {
  content: "";
  position: absolute;
  bottom: 10px;
  left: 62.5px;
  width: 25px;
  height: 3px;
  margin: 0 auto;
  border-radius: 2px;
  background-color: #f20d0d;
}

/* 评论框子 */
.questions_div {
  display: none;
  position: fixed;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.349);
  z-index: 10;
}

h4{
  padding-left: 20px;
}

.questions{
  min-width: 700px;
  min-height: 500px;
  padding-top: 20px;
}

/*输入内容*/
.questions_input{
  resize: none;
  padding: 10px;
  width: 90%;
  height: 75%;
  border: 2px solid black;
  border-radius: 10px;
  font-size: 25px;
  margin-top: 50px;
  margin: 0 5%;
}

/*提交按钮*/
#close_btn{
  font-size: 24px;
  width: 20%;
  height: 10%;
  margin: 20px 40%;
}

/* 评论页面 */
.questions {
  top: 15%;
  left: 25%;
  position: fixed;
  width: 50%;
  height: 70%;
  background-color: white;
}

/* 关闭评论页面 */
.close {
  position: absolute;
  right: 0;
  top: 0;
  width: 32px;
  height: 32px;
  float: right;
  margin: 5px;
}
.close:hover{
  background-color: rgba(0, 0, 0, 0.23);
  cursor: pointer;
}
  /* 视频下内容盒 */
.under_video {
  width: 1200px;
  /* height: 500px; */
  margin: 20px auto 0;
  /* background-color: rgb(110, 59, 59); */
}
/* 评论盒子 */
.comment {
  float: left;
  width: 800px;
}
.comment::after {
  content: "";
  clear: both;
}
/* 别人的问题 */
.others_comment {
  width: 800px;
  margin: 10px 0;
  height: 50px;
  background-color: #fff;
}

/* 评论筛选 */
.others_comment a {
  margin: 4px 10px 0;
  font-size: 12px;
  width: 48px;
  height: 32px;
  float: left;
  text-align: center;
  line-height: 32px;
  background-color: #55616e21;
  border-radius: 16px;
}

/* 小有所得按钮样式 */
.others_comment .open_questions {
  margin: 0 10px;
  font-size: 14px;
  width: 100px;
  height: 40px;
  float: right;
  text-align: center;
  line-height: 40px;
}

.others_comment a:hover {
  background-color: #55616e70;
}

/* 被选中评论类型 */
.others_comment .checked {
  color: #ffffff;
  background-color: #55616e;
  cursor: default;
}
.others_comment .checked:hover {
  background-color: #55616e;
}

/* 用户评论盒子 */
.user_comment {
  border-radius: 10px;
  margin-top: 10px;
  box-shadow: 0 4px 8px 0 rgb(28 31 33 / 10%);
  width: 740px;
  padding: 20px 30px;
  position: relative;
  float: left;
}

.user_comment::after {
  content: "";
  clear: both;
}

/* 用户姓名 */
.user_info {
  width: 740px;
  height: 20px;
}

/* 用户昵称 */
.username {
  float: left;
  text-align: left;
  line-height: 20px;
  font-weight: 700;
  font: 14px;
  color: #1c1f21;
}

/* 用户评价内容 */
.content {
  margin: 5px 0;
  width: 740px;
  line-height: 28px;
  font-size: 14px;
  color: #14191e;
  text-align: left;
  margin-top: 8px;
  font: 15px/1.5 "PingFang SC", "微软雅黑",
    "Microsoft YaHei", Helvetica, "Helvetica Neue",
    Tahoma, Arial, sans-serif;
  color: #1c1f21;
}

/* 点赞+评价时间 */
.operation {
  margin: 10px 0;
  float: right;
  width: 740px;
  height: 40px;
  margin-top: 10px;
  color: #b5b9bc;
  font-size: 12px;
  line-height: 20px;
}

/* 点赞 */
.actions_a {
  position: relative;
  float: left;
  width: 75px;
  height: 40px;
  border-radius: 20px;
  background-color: #545c6323;
}
.actions a:hover {
  background-color: #545c6341;
}

/* 点赞图标 */
.icon_thumb_revert {
  position: absolute;
  left: 20px;
  top: 10px;
  width: 20px;
  height: 20px;
  background-image: url("../../images/learn/点赞.png");
  background-size: 20px 20px;
}

/* 时间右浮动 */
.operation .time_div {
  margin-top: 10px;
  font-size: 12px;
  float: right;
}

/* 点赞次数 */
.actions_a em {
  font-size: 12px;
  position: absolute;
  top: 3px;
  left: 45px;
  font-style: normal;
}

/* 笔记盒子 */
.note {
  display: none;
  float: left;
  width: 800px;
}
.note::after {
  content: "";
  clear: both;
}
/* 写评论弹窗 */
.others_note {
  width: 800px;
  margin: 10px 0;
  height: 50px;
}

/* 小有所得按钮样式 */
.others_note .open_note {
  background-color: #55616e21;
  float: left;
  font-size: 14px;
  width: 100px;
  height: 40px;
  margin-left: 350px;
  text-align: center;
  border-radius: 10px;
  line-height: 40px;
}

.others_note a:hover {
  background-color: #55616e70;
}

/*分页*/
.page_btu{
  padding-top: 10px;
  clear: both;
  height: 50px;
  line-height: 50px;
  text-align: center;
}

.page{
  width: 80px;
  height: 30px;
  border: 0;
  border-radius: 10px;
  box-shadow: 0 1px 9px 1px rgba(0, 0, 0, 0.44);
  margin: 0 10px;
}
.page:hover{
  cursor: pointer;
  box-shadow: 0 1px 9px 1px rgba(0, 0, 0, 0.55);
}
.video_comment{
  /*min-height: 550px;*/
}